{"id":84702,"date":"2020-06-10T01:43:04","date_gmt":"2020-06-09T23:43:04","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/remote-desktop-glazami-atakuyushhego"},"modified":"2020-06-10T01:43:04","modified_gmt":"2020-06-09T23:43:04","slug":"remote-desktop-glazami-atakuyushhego","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/remote-desktop-glazami-atakuyushhego","title":{"rendered":"Kaugdesktopi vaatamine r\u00fcndaja silmade l\u00e4bi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h1 id=\"1-vvedenie\">1. Sissejuhatus<\/h1>\n<p><\/p>\n<p>Ettev\u00f5tted, kellel ei olnud korraldatud kaugjuurdep\u00e4\u00e4sus\u00fcsteeme, k\u00e4ivitasid need \u00e4\u00e4rmuslikus korras paar kuud tagasi. Mitte k\u00f5ik administraatorid ei olnud selliseks \u201ckuumuseks\u201d valmis, mille tulemusena tekkis turvalisuse puuduj\u00e4\u00e4ke: teenuste vale konfigureerimine v\u00f5i isegi vanade, eelnevalt tuvastatud haavatavustega tarkvaraversioonide installimine. M\u00f5ned neist puuduj\u00e4\u00e4kidest on juba \u00f6\u00f6bikuna tagasi tulnud, teised said rohkem \u00f5nne, kuid j\u00e4reldusi peaks tegema kindlasti k\u00f5ik. Loyaliteet kaug t\u00f6\u00f6tamise suhtes on mitmekordselt kasvanud ja \u00fcha rohkem ettev\u00f5tteid aktsepteerib kaugjuhtimist p\u00fcsiva vormina.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Nii et kaugjuurdep\u00e4\u00e4su tagamiseks on palju v\u00f5imalusi: erinevad VPN-id, RDS ja VNC, TeamViewer ja teised. Administratoritel on valida, tuginedes ettev\u00f5tte v\u00f5rgustiku ja seadmete spetsiifikale. K\u00f5ige populaarsemad j\u00e4\u00e4vad VPN-lahendused, kuid paljud v\u00e4ikesed ettev\u00f5tted valivad RDS (Remote Desktop Services), kuna need on lihtsamad ja kiiremad rakendada.<\/p>\n<p><\/p>\n<p>Selles artiklis r\u00e4\u00e4gime p\u00f5hjalikumalt RDS turvalisusest. Teeme l\u00fchi\u00fclevaate tuntud haavatavustest ning arutame mitu r\u00fcnnaku stseeni, mis on suunatud Active Directory p\u00f5hisele v\u00f5rguinfrastruktuurile. Loodame, et meie artikkel aitab kellelgi esitada \u00f5igeid ettepanekuid ja suurendada turvalisust.<\/p>\n<p><\/p>\n<h1 id=\"2-nedavnie-uyazvimosti-rdsrdp\">2. Hiljutised RDS\/RDP haavatavused<\/h1>\n<p><\/p>\n<p>Iga tarkvara sisaldab vigu ja haavatavusi, mida k\u00e4tkeb pahausklikud, ja RDS ei ole erandiks. Viimasel ajal on Microsoft sageli teatanud uutest haavatavustest, oleme otsustanud neist teha l\u00fchi\u00fclevaate:<\/p>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/portal.msrc.microsoft.com\/en-us\/security-guidance\/advisory\/CVE-2019-0787\">CVE-2019-0787<\/a><\/noindex><\/li>\n<\/ul>\n<p><\/p>\n<p>See haavatavus ohustab kasutajaid, kes \u00fchenduvad kompromiteeritud serveriga. R\u00fcndaja v\u00f5ib saada kontrolli kasutaja seadme \u00fcle v\u00f5i j\u00e4\u00e4da s\u00fcsteemi, et omada p\u00fcsivat kaugjuurdep\u00e4\u00e4su.<\/p>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/portal.msrc.microsoft.com\/en-US\/security-guidance\/advisory\/CVE-2019-1181\">CVE-2019-1181<\/a><\/noindex> \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/portal.msrc.microsoft.com\/en-US\/security-guidance\/advisory\/CVE-2019-1182\">CVE-2019-1182<\/a><\/noindex> \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/portal.msrc.microsoft.com\/en-US\/security-guidance\/advisory\/CVE-2020-0609\">CVE-2020-0609<\/a><\/noindex><\/li>\n<\/ul>\n<p><\/p>\n<p>See haavatavuste r\u00fchm v\u00f5imaldab volitamata r\u00fcndajal kaugest sooritada vale moodustatud p\u00e4ringu abil k\u00e4ituda RDS serveris. Neid saab kasutada ka usside \u2014 pahatahtliku tarkvara, mis nakatab k\u00f5rvalasuvad seadmed v\u00f5rgus iseseisvalt, loomiseks. Seega v\u00f5ivad need haavatavused ohustada kogu ettev\u00f5tte v\u00f5rku, ja ainsaks p\u00e4\u00e4steks on \u00f5igel ajal v\u00e4rskendamine.<\/p>\n<p><\/p>\n<p>Kaugjuurdep\u00e4\u00e4su tarkvara on saanud \u00fcha rohkem t\u00e4helepanu nii uurijate kui ka kurjategijate seas, seet\u00f5ttu v\u00f5ime varsti kuulda uutest sarnastest haavatavustest.<\/p>\n<p><\/p>\n<p>Hea uudis on see, et mitte k\u00f5ikidele haavatavustele ei ole avalikke eksploitte saadaval. Halb uudis on see, et eksperdiga kurjategijal ei tohiks olla raske haavatavuse eksploitimiseks kirjutada eksploit, olgu selleks siis kirjelduse p\u00f5hjal v\u00f5i kasutades selliseid tehnikaid nagu Patch Diffing (millest meie kolleegid on kirjutanud <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/dsec\/blog\/479972\/\">artiklis<\/a><\/noindex>). Seet\u00f5ttu soovitame regulaarselt tarkvara uuendada ja j\u00e4lgida uusi teatiseid avastatud haavatavuste kohta.<\/p>\n<p><\/p>\n<h1 id=\"3-ataki\">3. R\u00fcnnakud<\/h1>\n<p><\/p>\n<p>Liigume artikli teise ossa, kus n\u00e4itame, kuidas algavad r\u00fcnnakud Active Directory p\u00f5histesse v\u00f5rguinfrastruktuuridesse. <\/p>\n<p><\/p>\n<p>Kirjeldatud meetodid on rakendatavad j\u00e4rgmise r\u00fcndaja mudeli jaoks: kurjategija, kes omab kasutajakontot ja juurdep\u00e4\u00e4su Remote Desktop Gateway'le - terminaliserverile (mida sageli saab n\u00e4iteks v\u00e4lisest v\u00f5rgust). Nende meetodite rakendamisel suudab kurjategija j\u00e4tkata r\u00fcnnakut infrastruktuurile ja kinnistada oma kohalolekut v\u00f5rgus.<\/p>\n<p><\/p>\n<p>V\u00f5rgu konfiguratsioon erinevates juhtumites v\u00f5ib erineda, kuid kirjeldatud tehnikad on \u00fcsna universaalsed.<\/p>\n<p><\/p>\n<h2 id=\"primery-vyhoda-iz-ogranichennogo-okruzheniya-i-povysheniya-privilegiy\">N\u00e4ited piiratud keskkonnast v\u00e4ljumisest ja privileegide t\u00f5stmisest<\/h2>\n<p><\/p>\n<p>Remote Desktop Gateway'le juurdep\u00e4\u00e4su korral seisab kurjategija t\u00f5en\u00e4oliselt silmitsi teatud piiratud keskkonnaga. Terminaliserverisse \u00fchendudes k\u00e4ivitatakse rakendus: Remote Desktopi \u00fchenduse aken sisevahenditele, failihaldur, b\u00fcrootarkvara v\u00f5i m\u00f5ni muu tarkvara. <\/p>\n<p><\/p>\n<p>R\u00fcnnaku eesm\u00e4rk on saavutada juurdep\u00e4\u00e4s k\u00e4skude k\u00e4itamisele, see t\u00e4hendab cmd v\u00f5i powershelli k\u00e4ivitamisele. Sellele v\u00f5ivad kaasa aidata mitmed klassikalised Windowsi \u201cliivakastist\u201d p\u00f5genemise tehnikad. Vaadakem neid j\u00e4rgmises osas.<\/p>\n<p><\/p>\n<p><strong>Variant 1<\/strong>. Kurjategijal on juurdep\u00e4\u00e4s Remote Desktopi \u00fchenduse aknasse Remote Desktop Gateway raames:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Kaugdesktopi vaatamine r\u00fcndaja silmade l\u00e4bi\" src=\"\/wp-content\/uploads\/2020\/06\/10a6e31c6b674a3654d267d503a980cb.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Avaneb men\u00fc\u00fc \u201cShow Options\u201d. Kuvatakse valikud \u00fchenduse konfiguratsioonifailide manipuleerimiseks:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Kaugdesktopi vaatamine r\u00fcndaja silmade l\u00e4bi\" src=\"\/wp-content\/uploads\/2020\/06\/5751713ae2c4708844dbfe6275b6dd60.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Selles aknas on v\u00f5imalik probleemideta p\u00e4\u00e4seda Failihaldurisse, vajutades m\u00f5nda nupule \u201cOpen\u201d v\u00f5i \u201cSave\u201d:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Kaugdesktopi vaatamine r\u00fcndaja silmade l\u00e4bi\" src=\"\/wp-content\/uploads\/2020\/06\/22ffb81cb03cef358b308a4198d5df91.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Avatud File Explorer. Selle \u201eaadressiriba\u201d kaudu on v\u00f5imalik k\u00e4ivitada lubatud t\u00e4idetavaid faile ning ka failis\u00fcsteemi loendit. See v\u00f5ib olla r\u00fcndajale kasulik juhul, kui s\u00fcsteemsed kettad on varjatud ja neile otsene juurdep\u00e4\u00e4s on v\u00f5imatu:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Kaugdesktopi vaatamine r\u00fcndaja silmade l\u00e4bi\" src=\"\/wp-content\/uploads\/2020\/06\/57a0ede0267cac05f43ee7d75293b733.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>\u2192 <strong><noindex><a rel=\"nofollow\" href=\"https:\/\/youtu.be\/L6kTjr-5w9M\">Demovideo<\/a><\/noindex><\/strong><\/p>\n<p><\/p>\n<p>Sarnast stsenaariumi on v\u00f5imalik taastada n\u00e4iteks Microsoft Office'i paketi Exceli kaugkasutamise ajal. <\/p>\n<p><\/p>\n<p>\u2192 <strong><noindex><a rel=\"nofollow\" href=\"https:\/\/youtu.be\/m8pkTJpP6wY\">Demovideo<\/a><\/noindex><\/strong><\/p>\n<p><\/p>\n<p>Lisaks ei tohi unustada ka makrosid, mida selles kontoripaketis kasutatakse. Meie kolleegid on arutanud makrode turbeprobleemi selles <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/dsec\/blog\/353800\/\">artiklis<\/a><\/noindex>.<\/p>\n<p><\/p>\n<p><strong>Option 2<\/strong>. Kasutades samu sisendandmeid nagu eelmisel juhul, k\u00e4ivitab r\u00fcndaja mitu kaugliidest \u00fchendust sama konto alla. Taask\u00e4ivitusel suletakse esimene \u00fchendus ja ekraanile ilmub veateade. Selle akna abifunktsioon k\u00e4ivitab serveris Internet Exploreri, p\u00e4rast mida suudab r\u00fcndaja navigeerida File Explorerisse.<\/p>\n<p><\/p>\n<p>\u2192 <strong><noindex><a rel=\"nofollow\" href=\"https:\/\/youtu.be\/yBKt6TZggxc\">Demovideo<\/a><\/noindex><\/strong><\/p>\n<p><\/p>\n<p><strong>Variant 3<\/strong>. Kui t\u00e4idetavate failide k\u00e4ivitamisele on seatud piirangud, v\u00f5ib r\u00fcndaja sattuda olukorda, kus grupipoliitikad keelavad cmd.exe k\u00e4ivitamise administraatorina.<\/p>\n<p><\/p>\n<p>On olemas viis seda k\u00f5rvale hiilida, k\u00e4ivitades bat-faili kaugliidese kaudu sisu kujul cmd.exe \/K . Cmd-i k\u00e4ivitamisel esinev t\u00f5rge ja bat-faili eduka t\u00e4itmise n\u00e4ide on toodud alloleval joonisel.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Kaugdesktopi vaatamine r\u00fcndaja silmade l\u00e4bi\" src=\"\/wp-content\/uploads\/2020\/06\/3cc118158345110d82461c9133a048c6.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><strong>Variant 4<\/strong>. Rakenduste k\u00e4ivitamise keeldude kehtestamine t\u00e4idetavate failide nimede p\u00f5hjal ei ole panacea, neid saab k\u00f5rvale hiilida. <\/p>\n<p><\/p>\n<p>K\u00e4sitleme j\u00e4rgmist stsenaariumi: oleme keelanud juurdep\u00e4\u00e4su k\u00e4sureale, keelanud Internet Exploreri ja PowerShelli k\u00e4ivitamise grupipoliitikate abil. R\u00fcndaja \u00fcritab kutsuda abi \u2013 pole mingit tagasisidet. \u00dcritab k\u00e4ivitada PowerShelli kontekstimen\u00fc\u00fc kaudu, mis kutsutakse esile allhoidmisega \u2013 teade, et k\u00e4ivitamine on blokeeritud administraatori poolt. \u00dcritab k\u00e4ivitada PowerShelli aadressiriba kaudu \u2013 taas pole mingit tagasisidet. Kuidas piirangut k\u00f5rvaldada? <\/p>\n<p><\/p>\n<p>Piisab, kui kopeerida powershell.exe kaustast C:WindowsSystem32WindowsPowerShellv1.0 kasutaja kausta, muuta nimi erinevaks kui powershell.exe ja k\u00e4ivitamise v\u00f5imalus avaneb.<\/p>\n<p><\/p>\n<p>Vaikimisi, kui \u00fchendate kaugliidese kaudu, antakse juurdep\u00e4\u00e4s kliendi lokaalsetele ketastele, kust r\u00fcndaja saab kopeerida powershell.exe ja p\u00e4rast \u00fcmbernimetamist k\u00e4ivitada.<\/p>\n<p><\/p>\n<p>\u2192 <strong><noindex><a rel=\"nofollow\" href=\"https:\/\/youtu.be\/nLdxEbr4Gk8\">Demovideo<\/a><\/noindex><\/strong><\/p>\n<p><\/p>\n<p>Oleme esitanud vaid m\u00f5ned viisi piirangute \u00fcletamiseks; tulevikus v\u00f5ib \u00fclesanne tulla veel palju, kuid neid \u00fchendab k\u00f5ikide jaoks p\u00e4\u00e4s Windowsi File Explorerisse. Rakendusi, mis kasutavad Windowsi standardseid viise failide t\u00f6\u00f6tlemiseks, on palju, ja kui viia need piiratud keskkonda, saab rakendada sarnaseid tehnikaid.<\/p>\n<p><\/p>\n<h1 id=\"4-rekomendacii-i-zaklyuchenie\">4. Soovitused ja j\u00e4reldus<\/h1>\n<p><\/p>\n<p>Nagu n\u00e4eme, on isegi piiratud keskkonnas r\u00fcnnaku jaoks arenguruumi. Kuid r\u00fcndaja elu v\u00f5ib raskendada. Toome v\u00e4lja \u00fcldised soovitused, mis on kasulikud nagu meie k\u00e4sitletud variantides, nii ka muudel juhtudel.<\/p>\n<p><\/p>\n<ul>\n<li>Piirake programmide k\u00e4ivitamist mustade \/ valgete loenditega, kasutades grupipoliitikaid.<br \/>\nKuid enamikul juhtudel j\u00e4\u00e4b v\u00f5imalus koodi k\u00e4ivitamiseks alles. Soovitame tutvuda projektiga <noindex><a rel=\"nofollow\" href=\"https:\/\/lolbas-project.github.io\/\">LOLBAS<\/a><\/noindex>, et saada \u00fclevaade dokumenteerimata viisidest failide manipuleerimiseks ja koodi k\u00e4itamiseks s\u00fcsteemis.<br \/>\nSoovitame kombineerida m\u00f5lemat t\u00fc\u00fcpi piiranguid: n\u00e4iteks v\u00f5ite lubada Microsofti poolt allkirjastatud t\u00e4idetavate failide k\u00e4ivitamise, kuid piirata cmd.exe k\u00e4ivitamist.<\/li>\n<li>Keelake Internet Explorer'i seadete vahekaartide aktiveerimine (seda saab teha kohapeal registris). <\/li>\n<li>Keelake Windowsi sisseehitatud abifunktsiooni k\u00e4ivitamine regedit'i kaudu.<\/li>\n<li>Keelake kohalike ketaste mountimine kaug\u00fchenduste jaoks, kui see piirang ei ole kasutajatele kriitiline.<\/li>\n<li>Piirake juurdep\u00e4\u00e4su kaugmasina lokaalsetele ketastele, j\u00e4ttes juurdep\u00e4\u00e4su ainult kasutaja kaustadele.<\/li>\n<\/ul>\n<p><\/p>\n<p>Loodame, et see oli teile v\u00e4hemalt huvitav ja maksimaalselt \u2014 see artikkel aitab teie ettev\u00f5tte kaugtegevust turvalisemaks muuta.<\/p>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/dsec\/blog\/505600\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>1. \u0412\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u041a\u043e\u043c\u043f\u0430\u043d\u0438\u0438, \u0443 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043d\u0435 \u0431\u044b\u043b\u0438 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u043d\u044b \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0434\u043e\u0441\u0442\u0443\u043f\u0430, \u0432 \u044d\u043a\u0441\u0442\u0440\u0435\u043d\u043d\u043e\u043c \u043f\u043e\u0440\u044f\u0434\u043a\u0435 \u0440\u0430\u0437\u0432\u043e\u0440\u0430\u0447\u0438\u0432\u0430\u043b\u0438 \u0438\u0445 \u043f\u0430\u0440\u0443 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u043d\u0430\u0437\u0430\u0434. \u041d\u0435 \u0432\u0441\u0435 \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440\u044b \u0431\u044b\u043b\u0438 \u0433\u043e\u0442\u043e\u0432\u044b \u043a \u0442\u0430\u043a\u043e\u0439 \u201c\u0436\u0430\u0440\u0435\u201d, \u043a\u0430\u043a \u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u0435 \u2014 \u0443\u043f\u0443\u0449\u0435\u043d\u0438\u044f \u0432 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438: \u043d\u0435\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u0430\u044f \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u044f \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u0432 \u0438\u043b\u0438 \u0434\u0430\u0436\u0435 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430 \u0443\u0441\u0442\u0430\u0440\u0435\u0432\u0448\u0438\u0445 \u0432\u0435\u0440\u0441\u0438\u0439 \u041f\u041e \u0441 \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u043d\u044b\u043c\u0438 \u0440\u0430\u043d\u0435\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u043c\u0438. \u041e\u0434\u043d\u0438\u043c \u044d\u0442\u0438 \u0443\u043f\u0443\u0449\u0435\u043d\u0438\u044f \u0443\u0436\u0435 \u0432\u0435\u0440\u043d\u0443\u043b\u0438\u0441\u044c \u0431\u0443\u043c\u0435\u0440\u0430\u043d\u0433\u043e\u043c, \u0434\u0440\u0443\u0433\u0438\u043c \u043f\u043e\u0432\u0435\u0437\u043b\u043e \u0431\u043e\u043b\u044c\u0448\u0435, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":84703,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-84702","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - 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